Pop\Image\Gd::setCompression PHP Method

    public function setCompression($comp = null)
    {
        $this->setQuality($comp);
        return $this;
    }

 public function testImageAttributes()
 {
     $i = new Gd(__DIR__ . '/../tmp/test.jpg');
     $i->setCompression(75);
     $i->setFillColor(new Rgb(255, 0, 0));
     $i->setStrokeColor(new Rgb(0, 0, 255));
     $i->setStrokeWidth(5);
     $this->assertEquals(640, $i->getWidth());
     $this->assertEquals(480, $i->getHeight());
     $this->assertEquals(3, $i->getChannels());
     $this->assertEquals(8, $i->getDepth());
     $this->assertEquals('RGB', $i->getColorMode());
     $this->assertFalse($i->hasAlpha());
 }